<?php
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PASS", "");
define("DB_NAME", "review_app");
//新建连接
$conn = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
//检查连接
if ($conn->connect_error) {
   die("连接失败" . $conn->connect_error);
}
echo "连接成功!";
